hw/soc_dma.h

   1 /*
   2  * On-chip DMA controller framework.
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  * Written by Andrzej Zaborowski <andrew@openedhand.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 or
  10  * (at your option) version 3 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "memory.h"
  22
  23 struct soc_dma_s;
  24 struct soc_dma_ch_s;
  25 typedef void (*soc_dma_io_t)(void *opaque, uint8_t *buf, int len);
  26 typedef void (*soc_dma_transfer_t)(struct soc_dma_ch_s *ch);
  27
  28 enum soc_dma_port_type {
  29     soc_dma_port_mem,
  30     soc_dma_port_fifo,
  31     soc_dma_port_other,
  32 };
  33
  34 enum soc_dma_access_type {
  35     soc_dma_access_const,
  36     soc_dma_access_linear,
  37     soc_dma_access_other,
  38 };
  39
  40 struct soc_dma_ch_s {
  41     /* Private */
  42     struct soc_dma_s *dma;
  43     int num;
  44     QEMUTimer *timer;
  45
  46     /* Set by soc_dma.c */
  47     int enable;
  48     int update;
  49
  50     /* This should be set by dma->setup_fn().  */
  51     int bytes;
  52     /* Initialised by the DMA module, call soc_dma_ch_update after writing.  */
  53     enum soc_dma_access_type type[2];
  54     hwaddr vaddr[2];    /* Updated by .transfer_fn().  */
  55     /* Private */
  56     void *paddr[2];
  57     soc_dma_io_t io_fn[2];
  58     void *io_opaque[2];
  59
  60     int running;
  61     soc_dma_transfer_t transfer_fn;
  62
  63     /* Set and used by the DMA module.  */
  64     void *opaque;
  65 };
  66
  67 struct soc_dma_s {
  68     /* Following fields are set by the SoC DMA module and can be used
  69      * by anybody.  */
  70     uint64_t drqbmp;    /* Is zeroed by soc_dma_reset() */
  71     qemu_irq *drq;
  72     void *opaque;
  73     int64_t freq;
  74     soc_dma_transfer_t transfer_fn;
  75     soc_dma_transfer_t setup_fn;
  76     /* Set by soc_dma_init() for use by the DMA module.  */
  77     struct soc_dma_ch_s *ch;
  78 };
  79
  80 /* Call to activate or stop a DMA channel.  */
  81 void soc_dma_set_request(struct soc_dma_ch_s *ch, int level);
  82 /* Call after every write to one of the following fields and before
  83  * calling soc_dma_set_request(ch, 1):
  84  *   ch->type[0...1],
  85  *   ch->vaddr[0...1],
  86  *   ch->paddr[0...1],
  87  * or after a soc_dma_port_add_fifo() or soc_dma_port_add_mem().  */
  88 void soc_dma_ch_update(struct soc_dma_ch_s *ch);
  89
  90 /* The SoC should call this when the DMA module is being reset.  */
  91 void soc_dma_reset(struct soc_dma_s *s);
  92 struct soc_dma_s *soc_dma_init(int n);
  93
  94 void soc_dma_port_add_fifo(struct soc_dma_s *dma, hwaddr virt_base,
  95                 soc_dma_io_t fn, void *opaque, int out);
  96 void soc_dma_port_add_mem(struct soc_dma_s *dma, uint8_t *phys_base,
  97                 hwaddr virt_base, size_t size);
  98
  99 static inline void soc_dma_port_add_fifo_in(struct soc_dma_s *dma,
 100                 hwaddr virt_base, soc_dma_io_t fn, void *opaque)
 101 {
 102     return soc_dma_port_add_fifo(dma, virt_base, fn, opaque, 0);
 103 }
 104
 105 static inline void soc_dma_port_add_fifo_out(struct soc_dma_s *dma,
 106                 hwaddr virt_base, soc_dma_io_t fn, void *opaque)
 107 {
 108     return soc_dma_port_add_fifo(dma, virt_base, fn, opaque, 1);
 109 }